Stripe提供了这个很棒的javascript库来检测卡片方案。让我添加一些代码片段，并向您展示如何使用它。

首先包括它到你的网页作为

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery.payment/1.2.3/jquery.payment.js " ></script>

其次，利用功能cardType来检测卡片方案。

$(document).ready(function() {              
            var type = $.payment.cardType("4242 4242 4242 4242"); //test card number
            console.log(type);                                   
}); 

这里有更多示例和演示的参考链接。

Stripe博客的jquery.payment.js Github库

下面是一些用Python编写的布尔函数的示例，如果根据函数名检测到卡片，则返回True。

def is_american_express(cc_number):
    """Checks if the card is an american express. If us billing address country code, & is_amex, use vpos
    https://en.wikipedia.org/wiki/Bank_card_number#cite_note-GenCardFeatures-3
    :param cc_number: unicode card number
    """
    return bool(re.match(r'^3[47][0-9]{13}$', cc_number))


def is_visa(cc_number):
    """Checks if the card is a visa, begins with 4 and 12 or 15 additional digits.
    :param cc_number: unicode card number
    """

    # Standard Visa is 13 or 16, debit can be 19
    if bool(re.match(r'^4', cc_number)) and len(cc_number) in [13, 16, 19]:
        return True

    return False


def is_mastercard(cc_number):
    """Checks if the card is a mastercard. Begins with 51-55 or 2221-2720 and 16 in length.
    :param cc_number: unicode card number
    """
    if len(cc_number) == 16 and cc_number.isdigit():  # Check digit, before cast to int
        return bool(re.match(r'^5[1-5]', cc_number)) or int(cc_number[:4]) in range(2221, 2721)
    return False


def is_discover(cc_number):
    """Checks if the card is discover, re would be too hard to maintain. Not a supported card.
    :param cc_number: unicode card number
    """
    if len(cc_number) == 16:
        try:
            # return bool(cc_number[:4] == '6011' or cc_number[:2] == '65' or cc_number[:6] in range(622126, 622926))
            return bool(cc_number[:4] == '6011' or cc_number[:2] == '65' or 622126 <= int(cc_number[:6]) <= 622925)
        except ValueError:
            return False
    return False


def is_jcb(cc_number):
    """Checks if the card is a jcb. Not a supported card.
    :param cc_number: unicode card number
    """
    # return bool(re.match(r'^(?:2131|1800|35\d{3})\d{11}$', cc_number))  # wikipedia
    return bool(re.match(r'^35(2[89]|[3-8][0-9])[0-9]{12}$', cc_number))  # PawelDecowski


def is_diners_club(cc_number):
    """Checks if the card is a diners club. Not a supported card.
    :param cc_number: unicode card number
    """
    return bool(re.match(r'^3(?:0[0-6]|[68][0-9])[0-9]{11}$', cc_number))  # 0-5 = carte blance, 6 = international


def is_laser(cc_number):
    """Checks if the card is laser. Not a supported card.
    :param cc_number: unicode card number
    """
    return bool(re.match(r'^(6304|670[69]|6771)', cc_number))


def is_maestro(cc_number):
    """Checks if the card is maestro. Not a supported card.
    :param cc_number: unicode card number
    """
    possible_lengths = [12, 13, 14, 15, 16, 17, 18, 19]
    return bool(re.match(r'^(50|5[6-9]|6[0-9])', cc_number)) and len(cc_number) in possible_lengths


# Child cards

def is_visa_electron(cc_number):
    """Child of visa. Checks if the card is a visa electron. Not a supported card.
    :param cc_number: unicode card number
    """
    return bool(re.match(r'^(4026|417500|4508|4844|491(3|7))', cc_number)) and len(cc_number) == 16


def is_total_rewards_visa(cc_number):
    """Child of visa. Checks if the card is a Total Rewards Visa. Not a supported card.
    :param cc_number: unicode card number
    """
    return bool(re.match(r'^41277777[0-9]{8}$', cc_number))


def is_diners_club_carte_blanche(cc_number):
    """Child card of diners. Checks if the card is a diners club carte blance. Not a supported card.
    :param cc_number: unicode card number
    """
    return bool(re.match(r'^30[0-5][0-9]{11}$', cc_number))  # github PawelDecowski, jquery-creditcardvalidator


def is_diners_club_carte_international(cc_number):
    """Child card of diners. Checks if the card is a diners club international. Not a supported card.
    :param cc_number: unicode card number
    """
    return bool(re.match(r'^36[0-9]{12}$', cc_number))  # jquery-creditcardvalidator

看看这个:

http://www.breakingpar.com/bkp/home.nsf/0/87256B280015193F87256CC70060A01B

function isValidCreditCard(type, ccnum) {
    /* Visa: length 16, prefix 4, dashes optional.
    Mastercard: length 16, prefix 51-55, dashes optional.
    Discover: length 16, prefix 6011, dashes optional.
    American Express: length 15, prefix 34 or 37.
    Diners: length 14, prefix 30, 36, or 38. */

    var re = new Regex({
        "visa": "/^4\d{3}-?\d{4}-?\d{4}-?\d",
        "mc": "/^5[1-5]\d{2}-?\d{4}-?\d{4}-?\d{4}$/",
        "disc": "/^6011-?\d{4}-?\d{4}-?\d{4}$/",
        "amex": "/^3[47]\d{13}$/",
        "diners": "/^3[068]\d{12}$/"
    }[type.toLowerCase()])

    if (!re.test(ccnum)) return false;
    // Remove all dashes for the checksum checks to eliminate negative numbers
    ccnum = ccnum.split("-").join("");
    // Checksum ("Mod 10")
    // Add even digits in even length strings or odd digits in odd length strings.
    var checksum = 0;
    for (var i = (2 - (ccnum.length % 2)); i <= ccnum.length; i += 2) {
        checksum += parseInt(ccnum.charAt(i - 1));
    }
    // Analyze odd digits in even length strings or even digits in odd length strings.
    for (var i = (ccnum.length % 2) + 1; i < ccnum.length; i += 2) {
        var digit = parseInt(ccnum.charAt(i - 1)) * 2;
        if (digit < 10) { checksum += digit; } else { checksum += (digit - 9); }
    }
    if ((checksum % 10) == 0) return true;
    else return false;
}

follow Luhn’s algorithm

 private  boolean validateCreditCardNumber(String str) {

        int[] ints = new int[str.length()];
        for (int i = 0; i < str.length(); i++) {
            ints[i] = Integer.parseInt(str.substring(i, i + 1));
        }
        for (int i = ints.length - 2; i >= 0; i = i - 2) {
            int j = ints[i];
            j = j * 2;
            if (j > 9) {
                j = j % 10 + 1;
            }
            ints[i] = j;
        }
        int sum = 0;
        for (int i = 0; i < ints.length; i++) {
            sum += ints[i];
        }
        if (sum % 10 == 0) {
           return true;
        } else {
            return false;
        }


    }

then call this method

Edittext mCreditCardNumberEt;

 mCreditCardNumberEt.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

             int cardcount=   s.toString().length();
                 if(cardcount>=16) {
                    boolean cardnumbervalid=   validateCreditCardNumber(s.toString());
                    if(cardnumbervalid) {
                        cardvalidtesting.setText("Valid Card");
                        cardvalidtesting.setTextColor(ContextCompat.getColor(context,R.color.green));
                    }
                    else {
                        cardvalidtesting.setText("Invalid Card");
                        cardvalidtesting.setTextColor(ContextCompat.getColor(context,R.color.red));
                    }
                }
               else if(cardcount>0 &&cardcount<16) {
                     cardvalidtesting.setText("Invalid Card");
                     cardvalidtesting.setTextColor(ContextCompat.getColor(context,R.color.red));
                }

                else {
                    cardvalidtesting.setText("");

                }


                }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

试试kotlin。添加Regex并添加到when语句中。

private fun getCardType(number: String): String {

        val visa = Regex("^4[0-9]{12}(?:[0-9]{3})?$")
        val mastercard = Regex("^5[1-5][0-9]{14}$")
        val amx = Regex("^3[47][0-9]{13}$")

        return when {
            visa.matches(number) -> "Visa"
            mastercard.matches(number) -> "Mastercard"
            amx.matches(number) -> "American Express"
            else -> "Unknown"
        }
    }

这里有完整的c#或VB代码，用于各种CC相关的东西。

IsValidNumber GetCardTypeFromNumber GetCardTestNumber PassesLuhnTest

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